JPS6152616B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a mounting device for a step motor in which a stator and a rotor face each other face to face.

[Background technology]

The drive mechanism of clocks, timers, etc. that uses a general step motor usually includes a stator, a crystal oscillator,
A motor is constructed by disposing frequency dividing circuit components, a rotor, etc. on a printed circuit board, and a front gear of a power transmission mechanism, such as a crown gear, is meshed with the gear of the motor. In such a step motor,
The structure is longer in the lateral direction, and the entire drive mechanism becomes larger.

In addition, electronic circuits such as a crystal oscillator and frequency dividing circuit components are sealed in a container to form an oscillator block, and this block is housed in a cylindrical yoke that also serves as the stator of the motor, and the magnetic pole piece at the bottom of the cylindrical yoke is There is also a so-called face-to-face type step motor in which the rotors face each other. This requires tedious processing in manufacturing the motor itself, which involves drawing the yoke into a cylindrical shape and then forming the magnetic pole pieces.
When attaching the motor to the motor fixing board, a special attachment member was required separately.

[Purpose of the invention]

The present invention has been made in view of the above reasons, and its purpose is to provide a step motor mounting device that makes the motor itself inexpensive and compact, and that also makes the motor fixed at a low cost and compact. .

[Disclosure of the Invention] (Example) An example of the present invention will be described below with reference to FIGS. 1 to 6.

Reference numeral 9 denotes a motor case molded from plastic, and has a generally rectangular parallelepiped shape as a whole. On one longitudinal side of this rectangular parallelepiped, there is a through inner cavity 9a for accommodating a coil to be described later, and on the other longitudinal side, there is a bottomed cylindrical part 9c for accommodating an oscillator block to be described later. Each is formed. This bottomed cylindrical portion 9c has an opening at the other end in the longitudinal direction, and a bottom at a portion which becomes one side wall in the longitudinal direction of the through-inner space 9a. Furthermore, the motor case 9 is provided with a plurality of locking protrusions 9b on the side surface of the rectangular parallelepiped where the opposing side walls of the through-hole inner space 9a are located. Note that it is desirable that the upper and lower surfaces through which the through-inner cavity 9a penetrates and the side surface on the through-inner cavity 9a side have a stepped shape sunken by the thickness of the yoke, which will be described later.

Reference numeral 5 denotes a coil wound around the coil frame 4, and as described above, it is accommodated in the through-hole inner space 9a. Reference numeral 6 denotes an iron core passing through the coil frame 4, that is, the axis of the coil 5.

Reference numeral 8 denotes a yoke formed of a magnetic plate material and having a U-shaped cross section, and the opposing piece has an area capable of closing the opening of the through-hole inner space 9a, and also has a fixing member for fixing a yoke piece 7, which will be described later. A hole 8c is provided,
The distance between the opposing pieces is approximately equal to the depth of the through-hole inner space 9a. It should be noted that when the motor case 9 is provided with the above-mentioned stepped shape, the width of the yoke 8 inevitably becomes slightly smaller than that of the motor case 9. In addition, the connecting piece that connects both opposing pieces has a wide magnetic pole piece 8.
A and narrow magnetic pole pieces 8b are arranged alternately and radially facing each other, and a hole 8d for fixing the iron core 6 is provided at the center of both magnetic pole pieces 8a, 8b. Both magnetic pole pieces 8
a, 8b are not at equal angular intervals, as shown in Figure 4, α
<β so that one-way self-starting property is obtained.

Reference numeral 7 denotes a yoke piece formed in a flat plate shape from a magnetic material, and has fixing protrusions 7a on both end faces of the yoke 8 on sides that are approximately equal to the spacing between opposing pieces for fixing to the fixing hole 8c.
A hole for fixing the iron core 6 is provided at the center of the base.

12 is a rotor having a permanent magnet 11 magnetized with different poles (N pole and S pole) alternately in the circumferential direction, integrally forming a gear that transmits rotation, and a rotor fixed to the end face of the iron core 6. It is rotatably attached to the child shaft 10.
The magnetization width of this permanent magnet 11 is as shown in FIG.
(α+β)/2, and the numbers of poles of the rotor 12 and yoke 8 are the same. Therefore, this permanent magnet 11 is
It faces both magnetic pole pieces 8a and 8b of the yoke 8 with a predetermined gap therebetween.

An oscillator block 1 includes a crystal oscillator 1a, a frequency dividing circuit 1b, an inverter 1c, etc., and is housed in a bottomed cylindrical portion 9c with input and output terminals 2 and 3 protruding from its bottom.

13 is a plate-shaped cover that closes the opening of the bottomed cylinder portion 9c of the motor case 9;
A hole 13a through which the input terminal 2 of the oscillator block 1 projects and a boss 13b which presses and supports the bottom surface of the oscillator block 1 are provided.

Therefore, the penetrating inner cavity 9a of the motor case 9
The coil 5 and the yoke piece 7 are housed in the yoke piece 7, and the iron core 6 is inserted therethrough and one end of the iron core 6 is fixed to the fixing hole of the yoke piece 7. Next, the yoke 8 is attached to the motor case 9 so that both opposing pieces of the yoke 8 close the through-hole inner space 9a, and the fixing protrusion 7a of the yoke piece 7 is inserted into the fixing hole 8c, and the iron core is inserted into the fixing hole 8d. Fix the other ends of 6. Further, the oscillator block 1 is housed in the bottomed cylindrical portion 9c of the motor case 9, both ends 5a of the coil 5 are connected to the output terminal 3, and the opening thereof is closed with a cover 13. Thereby, the motor excluding the rotor 12 can be configured into a substantially rectangular parallelepiped. After this,
The rotor shaft 10 is fixed to the end face of the iron core 6, and the rotor 1
Attach 2.

In such a motor, when a constant voltage is applied to the input terminal 2 of the oscillator block 1, a voltage having a predetermined pulse width is applied from the output terminal 3 to the coil 5 with the polarity alternately reversed.
When the polarities a and 8b become the required polarities, the rotor 12 rotates in steps.

Reference numeral 15 denotes a fixed base plate for fixing the motor, on which both ends of an elastic mounting member 16 bent into a predetermined shape are rotatably provided. The elastic mounting member 16 is formed by bending a bar-shaped member into a U-shape, with both ends bent outward, and both ends are supported by the fixed base plate 15 and serve as a center of rotation. Further, the depth of the U-shape is set to be slightly smaller than the dimension from the bottom surface of the motor case 9 to the locking surface of the locking protrusion 9b.

However, the above motor has a motor fixing board 1
The bottom surface of the motor case 9 is placed on the motor case 9, and the U-shaped base of the elastic mounting member 16 is elastically engaged with the engagement protrusion 9b of the motor case 9 to be attached to the motor fixing board 15.

Note that if the through-hole inner space 9a of the motor case 9 is designed to be sufficiently larger than the coil 5 in the axial direction, the yoke piece 7 of the iron core 6 can be fixed in advance and the coil 5 can be passed through the iron core 6. can be accommodated in the through-hole inner space 9a. Further, the elastic mounting member 16 is not limited to the U-shape.

〔Effect of the invention〕

According to the present invention, since the motor part excluding the rotor is formed into a substantially rectangular parallelepiped shape by the plastic motor case and the magnetic plate material yoke, the motor can be made inexpensive and compact so that it can be easily incorporated into equipment. When attaching the motor to the fixed board, it is only necessary to elastically lock the elastic mounting member to the locking protrusion of the motor case, so a step motor mounting device that is inexpensive and compact even when the motor is fixed can be obtained. It will be done.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing one embodiment of the motor portion of the present invention, FIG. 2 is a sectional view thereof, FIG. 3 is a perspective view showing one embodiment of the present invention, and FIG.
FIG. 5 is a plan view showing the magnetic pole pieces of the yoke, FIG. 5 is a plan view showing the permanent magnets of the rotor, and FIG. 6 is an electric circuit diagram of the oscillator block. 1...Oscillator block, 1a...Crystal oscillator,
2b... Frequency dividing circuit, 1c... Inverter, 2...
Input terminal, 3... Output terminal, 5... Coil, 6...
...Iron core, 7...Yoke piece, 8...Yoke, 9...
Motor case, 9a...through inner cavity 9a, 9b
... Locking protrusion, 9c ... Bottomed cylinder part, 10 ... Rotor shaft, 11 ... Permanent magnet, 12 ... Rotor, 13
...Cover, 15...Motor fixing board, 16...
...Elastic mounting member.

Claims (1)

[Claims] 1. A rectangular parallelepiped that has a generally rectangular parallelepiped shape as a whole, and has a through inner cavity on one side in the longitudinal direction of the rectangular parallelepiped, a bottomed cylindrical part whose end face is an opening on the other side, and a side wall opposite to the through inner cavity on the other side. a plastic motor case each having locking protrusions formed on its side surfaces; a coil accommodated in the through-hole; an iron core passing through the axis of the coil; and an opposing piece having a U-shaped cross section. has an area capable of closing the opening of the through-hole inner space, and the connecting pieces have wide magnetic poles and narrow magnetic poles arranged alternately and radially, and the wide magnetic poles and narrow magnetic poles are equally spaced. Adjacent wide magnetic poles and narrow magnetic poles are arranged opposite to each other at angular intervals that are alternately wide and narrow, and the radial center of all magnetic poles of the connecting piece is magnetically coupled to one end of the iron core. a yoke made of a material, a yoke piece having both end surfaces magnetically coupled to both opposing pieces of the yoke and a base portion magnetically coupled to the other end of the iron core, and different poles alternately magnetized in the circumferential direction, and magnetic poles of the yoke. A substantially rectangular parallelepiped motor is constituted by a rotor facing the rotor with a predetermined gap and rotatably supported by the iron core, and an oscillator block housed in the bottomed cylindrical portion. A step motor mounting device comprising a mounting member elastically locked to the locking protrusion.